You didn't find more, because there are not too many.
You are right about links to other websites. But I do think that USA people should visit other website, because they can buy one piece as well there. Which is the point, to provide people what they are looking for.
I mentioned about code errors, they are there for a week, not longer, it's absolutely has nothing to do with rankings.
I wouldn't rank good in other countries where glass nail files is a main keyword. And still there are a lot of websites for that keyword. In UK for example, it has maybe as much people selling and ranking as in USA. I know USA is the biggest market and competitive, but still it doesn't answer the question.
wholesale glass nail files, is a competitive keyword, and we do rank good on it, even in USA, and there are other websites that rank for it as well.
Yes, China was a poor example, just don't think Google would think my site is spammy and still rank in other countries and for other keywords.
There is content for Swarovski glass nail files, as most of the companies sell them as well. We are just the best one.
I will think about the spammy things on the website. Maybe there is something in it. Maybe it's because I think our partner's site should rank better in USA for that specific keyword. Who knows.